JPH0417278Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to an organic wastewater treatment device, in which air is sent into a pressurized aeration tank, and the air is converted into fine bubbles and diffused into the pressurized aeration tank. It is designed to allow biological oxidation to proceed.

(Conventional Example) A pressurized aeration tank of a wastewater treatment device in which organic wastewater such as human waste or factory wastewater is aerated in a pressurized aeration tank to promote biological oxidation, and then sludge and clean water are separated in a flotation tank. There is a known method using a line mixer (Japanese Patent Publication No. 57-31959). This line mixer is, for example,
As disclosed in Publication No. 17790, there is a rotating part in which a stirring impeller that also serves as a pump and an impeller for a discharge pump are fitted on the same shaft, a stirring chamber having a circulation flow path, and a vortex of the discharge pump. It has a structure consisting of two parts: an outer casing with a suction port on one side and a discharge port on the other side.

(Problems to be Solved by the Invention) However, such line mixers have problems such as being complicated in structure and expensive, and requiring extremely strong mechanical stirring ability.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes a pressurized aeration tank 3 in which organic wastewater is pressurized and aerated to perform biological oxidation, and a In an organic wastewater treatment apparatus having a separation tank 17 for separating a solution into sludge and clean water, a stirring blade 4 is disposed inside the pressurized aeration tank 3, and a stirring blade 4 is provided inside the pressurized aeration tank 3. A circulation pump P2 and a circulation pipe 5 for circulating the solution are provided, and a suction part 5 of the circulation pipe 5 is provided.
a to the upper part of the pressurized aeration tank 3, connect the discharge part 5b of the circulation pipe 5 to the lower part of the pressurized aeration tank 3, and arrange the diffuser 8 so as to cover the discharge part 5b, An ultrasonic vibrator 7 is disposed near the differential user 8, and a compressor 10 for sending air to the circulation pipe 5 is connected.

(Function) In the above configuration, a circulation flow is generated inside and outside the pressurized aeration tank 3 by driving the circulation pump P2,
The air sent out from the compressor 10 is mixed with this circulation flow in the circulation pipe 5 and flows into the lower part of the pressurized aeration tank 3. In the discharge section 5b of the circulation pipe 5, the air is converted into fine bubbles by the ultrasonic waves generated by the ultrasonic vibrator 7, and is diffused by the diffuser 8. Therefore, a large amount of fine bubbles are evenly mixed into the tank 3, the aeration effect is enhanced, biological oxidation progresses significantly, and BOD is rapidly removed. Particularly in this case, the ultrasonic vibrator 7 and the diffuser 8 are provided close to each other in the vicinity of the discharge part 5b at the bottom of the pressurized aeration tank 3, and the diffuser 8 is provided so as to cover the discharge part 5b. When the reflux is discharged from the discharge part 5b, the air is pulverized by the ultrasonic vibrator 7 and diffused by the diffuser 8 simultaneously and efficiently, and the air instantly becomes fine bubbles and diffuses into the tank 3. Therefore, the aeration effect is greatly enhanced and BOD can be quickly removed.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a flowchart of an organic wastewater treatment apparatus, in which numeral 1 denotes a stirring tank in which organic wastewater such as excreta and industrial wastewater is stored and agitated by a stirring blade 2 driven by a motor M1. 3 is pump P
1 is a pressurized aeration tank for rapidly removing BOD by pressurizing and aerating the wastewater fed from the stirring tank 1, and the pressurizing aeration tank 3 is operated by the pump P1 and compressor 10 (described later). It is pressurized to about 6 atmospheres. The reason why the pressurized aeration tank 3 is pressurized is to dissolve air well and promote biological oxidation.

As shown in FIG. 2, this pressurized aeration tank 3 is provided with stirring blades 4 driven by a motor M3. 5 is a circulation pipe, and P2 is a circulation pump. The suction part 5a of the pipe 5 is connected to the upper part of the tank 3, and the discharge part 5b is connected to the lower part of the tank 3. The pump P2 is driven to pump the tank 3. Circulating flow is generated inside and outside, and the solution flowing into the tank 3 from the discharge part 5b rises from the bottom to the top of the tank 3. Reference numerals 7 and 8 denote an ultrasonic transducer and a diffuser which are arranged close to each other in the vicinity of the discharge section 5b. This differential user 8 is arranged so as to cover the discharge section 5b. 10 is a compressor, 11 is an ejector provided in the middle of the circulation pipe 5, and the compressor 1
The air sent out by the ultrasonic transducer 7 is mixed into the circulating flow flowing through the pipe 5 toward the tank 3 by the ejector 11, and flows into the tank 3 from the discharge part 5b. The BOD is crushed into fine bubbles by the diffuser 8 and diffused by the diffuser 8, and is dissolved uniformly in a large amount in the tank 3, increasing the aeration effect, and the biological oxidation progresses significantly to rapidly remove BOD. Particularly in this case, the ultrasonic vibrator 7 and the diffuser 8 are provided close to each other in the vicinity of the discharge part 5b at the bottom of the pressurized aeration tank 3, so that the ultrasonic vibrator 7 crushes the air and the diffuser 8 diffuses the air. are carried out at the same time, and the air instantly becomes fine bubbles and diffuses into the tank 3, so the aeration effect is extremely enhanced and the air is quickly
BOD can be removed. Moreover, since the diffuser 8 is provided so as to cover the discharge part 5b, the circulating flow discharged from the discharge part 5b and mixed with fine bubbles can be efficiently diffused into the tank 3. 12 is a pipe for returning a part of the solution in the tank 3 to the stirring tank 1. In FIG. 2, unnecessary piping for explanation is omitted.

Reference numeral 15 denotes a deaeration tank, which is provided with a stirring blade 16 driven by a motor M2, which stirs the solution sent from the pressurized aeration tank 3 to remove air bubbles such as titanium gas. 17 is a separation tank, 18 is a pressurized water tank, and the solution sent from the deaeration tank 15 by the pump P3 and the pressurized water sent from the pressurized water tank 18 are joined at a confluence part 19 in the middle, and the front part of the separation tank 17 is flows into. There is a partition wall 2 inside the separation tank 17.
0, 21, and 22 are installed, and the water is separated from the partition wall 2.
0, 21 and submerged through the partition wall 22, the almost purified water is discharged through a pipe 23 as primary treated water. Further, the floating sludge is scraped out by a scraping device 24 to a side sludge tank 25, and is returned to the stirring tank 1 as activated sludge through a pipe 26. A part of the clean water is also sent to the pressurized water tank 18 by the pump P4. Air is sent to the pressurized water tank 18 from the compressor 10, and pressurized water containing a large amount of air bubbles is generated in the pressurized water tank 18, but this pressurized water is mixed with the solution sent from the degassing tank 15 as described above. mixed with separation tank 17
The sludge enters the sludge, floats with air bubbles attached thereto, and is scraped out by the scraping device 24 as described above.

(Effect of the invention) As described above, according to the invention, the air mixed into the circulation flow by the compressor 10 and flowing into the pressurized aeration tank 3 from the discharge part 5b is transferred to the ultrasonic vibrator 7.
They are converted into fine bubbles by the ultrasonic waves emitted by the diffuser 8, and are diffused by the diffuser 8 and mixed uniformly into the tank 3 in large quantities, increasing the aeration effect and significantly progressing biological oxidation.
BOD can be quickly removed. Particularly in this case, since the ultrasonic vibrator 7 and the diff user 8 are provided close to each other near the discharge part 5b at the bottom of the pressurized aeration tank 3, the pulverization of the air by the ultrasonic vibrator 7 and the diffusion by the diff user 8 are Simultaneously and efficiently, the air instantly becomes fine bubbles and diffuses into the tank 3, so the aeration effect is extremely enhanced. In addition, since the fine bubbles mixed with the circulating flow remain in the tank for a long time, the oxygen utilization efficiency is high, and even with a small amount of air supplied from the compressor 10, a sufficient aeration effect can be achieved. Since the supply rate is also increased, the activated sludge concentration in the pressurized aeration tank 3 can be kept high, and it is also possible to treat high-concentration organic wastewater.

[Brief explanation of the drawing]

The figure shows an embodiment of the present invention.
The figure is a flowchart, and FIG. 2 is a sectional view of the pressurized aeration tank. 3... Pressurized aeration tank, 4... Stirring blade, 5... Circulation pipe, 5a... Suction part, 5b... Discharge part, 7
...Ultrasonic transducer, 8...Diff user, 10...
...Compressor, 17...Separation tank, P2...Circulation pump.

Claims (1)

[Scope of utility model registration request] An organic wastewater treatment device having a pressurized aeration tank 3 in which organic wastewater is pressurized and aerated to perform biological oxidation, and a separation tank 17 in which a solution sent out from the pressurized aeration tank 3 is separated into sludge and clean water. In addition to disposing stirring blades 4 inside the pressurized aeration tank 3, a circulation pump P circulates the solution in the pressurized aeration tank 3.
2 and a circulation pipe 5 are provided, and the suction part 5a of the circulation pipe 5 is connected to the upper part of the pressurized aeration tank 3, and the discharge part 5b of the circulation pipe 5 is connected to the lower part of the pressurized aeration tank 3. A differential user 8 is disposed so as to cover the discharge portion 5b, and an ultrasonic vibrator 7 is disposed near the differential user 8,
An organic wastewater treatment apparatus characterized in that a compressor 10 for sending air is connected to the circulation pipe 5.